Some Alfa clocks have a wedge globe and holder in the back of them, some have a small globe soldered onto the circuit board, due to poor contacts, the globes get hot and melt the globe holder that turns into a blob of molten plastic, and that doesn't make sense, the globes have 2 settings, bright when used during the day with no lights, then dim, when the headlights are on, so you don't get blinded at night, at night the cicuit goes through a resistor, and the globe can get hot, replacement depends on how much melting has taken place L.E.D. globes would be a good replacement, as they run cool, but how they would work with a resistor at night so its dim, is anyones guess, Colin.
